Minecart Spawner Item
Forge Eggs
Caged Eggs
Ender Eggs
Golden Eggs
Eggs dropping from spawners(vanilla if no data else use forge egg with full support of tag use full nbt or not)
Redstone Spawner ignores spawn boolean,
Upgrade Kits,
Spawners that have blast resistance based upon nbt of the mob
Random entity spawners(entire list is spawnpotentials and when spawning will pick random entries instead of just one)
new boolean for spawners needsPlayer() for spawner automation
Gaseous Entity when breaking spawners

make silkspawners plugin interface freindly. So I can just make the spawners compatible already using the plugin interface as an api.

have a pickentity event where a mob is a forge egg and a mob spawner can return an ender egg